Im at my wits end with this truck, two alts. new battery and still not charging. 03 ranger 4.0 L 4x4 level II. no fuses that I can find in this model only fusable links. why oh why will this not charge?

 

Did you try doing a load test? This test will identify if its the battery or alternator is the culprit.

 

Only place locally that does load testing on batteries has a broken tester. Tried 2 alts and 2 batteries

 

You can do your own load test if you have a volt meter and someone to crank the starter while you watch the voltage drop, disconnect coil for test.

Get a volt meter and test voltages at the alternator
But first measure battery voltage, 12.7v for new battery, and then start engine
After starting voltage at battery should read 14.5v or higher, and then drop down to 13.6v after a few minutes.
If you just get the 12.7v after starting then alternator is not "on"

Test voltages on the alternator with key OFF
See diagram
B+, black/orange stripe wire, should have battery voltage, 12.7v
A, yellow/white stripe wire should also have 12.7v
If either has low or no volts then you have a bad fusible link or wire

Then Key ON
The light green/red stripe wire is the "on" switch for the alternator, see diagram below

This is the charging circuit for 2003 Ranger

 

RonD is correct. Having a volt meter or multi tester would be sufficient.

 

Thanks for the help guys. I finally got it after checking the main wire from the battery to the alternator. realized that the fusable link was all corroded. replaced it and all is good. Thanks again

 

Thanks for posting the fix